If it's just 2 of you going north, you might want to check on a campervan or caravan. (You'll get used to the Australian terms. 
)
My trip was by myself and I rented a caravan (camper) My route was from Sydney (where I was born) to Perth and back. I slept in the van most of the time but treated myself to a hotel every 4-5 days.
If you're going to the outback, you might want some hiking boots that extend up your ankle a bit IF you are also going off the road.
Buying food is pretty close to our prices. Eating at a restaurant can be a lot more. Minimum wage--over $16.50
BUT if you can find a Subway or a decent American chain-type food joint, it's fairly close to our prices.... higher but not extremely so.
As far as gifts, I gave people American dollars 5's, 10's They LOVED them. (Conversation pieces when they meet THEIR friends) but that's up to you.
I'll try to think of more.
Oh...on the plane trip from the USA. BRING PILLOWS and try to get window seats so you can prop the pillows against the window. You'll thank me
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